Emerson Rosemount 700XA Reference Manual page 86

WARNING
Failure to follow this warning may result in injury or death to personnel or cause damage to the equipment.
Disconnect all electrical power to the gas chromatograph (GC) and ensure the area is free of explosive gases.
Procedure
1. Disconnect all power to the GC.
2. If you have not already done so, remove the explosion-proof dome and the thermal cover.
3. Unscrew and remove the TCDs from the TCD block and the gas connectors.
Figure 52: Components of a TCD
A. Gas tubing connector
B. TCD block
C. TCD 1 and TCD 2 retaainer nuts and thermistor leads
4. Loosen the two retainer nuts.
5. Use a flat head screw driver and remove the four TCD termination block screws.
6. The TCD thermistors are held within the TCD block by the retainer nut. To replace the thermistor, do the following:
a) Unscrew and release the thermistor leads from the termination block.
b) Unscrew the retainer nut from the TCD block.
86
July 2020
Emerson.com/Rosemount